"I sort of like acting. It gives me more flexibility. Do you understand that?" Trump told reporters as he left the White House for Camp David. "I like acting. We have a few that are acting but we have a great, great, Cabinet."

Except for chief of staff, each of those positions requires Senate confirmation.

Trump has tapped Wheeler as his choice for the permanent EPA administrator, picked former Attorney General William Barr to fill that position once again, and nominated Heather Nauert for ambassador to the United Nations.

Mulvaney is serving as acting chief of staff, replacing John KellyJohn Francis KellyMORE in the role. Mulvaney is remaining on as head of the Office of Management and Budget, but Deputy Director Russ Vought is handling the agency’s day-to-day operations while Mulvaney works as Trump’s top aide.